DiskSpaceService will not blow up if total or free space is null

src/NzbDrone.Core/DiskSpace/DiskSpaceService.cs

@@ -69,14 +69,19 @@ namespace NzbDrone.Core.DiskSpace
 
                 try
                 {
-                    var freeSpace = _diskProvider.GetAvailableSpace(path).Value;
-                    var totalSpace = _diskProvider.GetTotalSize(path).Value;
+                    var freeSpace = _diskProvider.GetAvailableSpace(path);
+                    var totalSpace = _diskProvider.GetTotalSize(path);
+
+                    if (!freeSpace.HasValue || !totalSpace.HasValue)
+                    {
+                        continue;
+                    }
 
                     diskSpace = new DiskSpace
                                 {
                                     Path = path,
-                                    FreeSpace = freeSpace,
-                                    TotalSpace = totalSpace
+                                    FreeSpace = freeSpace.Value,
+                                    TotalSpace = totalSpace.Value
                                 };
 
                     diskSpace.Label = _diskProvider.GetVolumeLabel(path);

src/NzbDrone.Mono/DiskProvider.cs

@@ -24,7 +24,15 @@ namespace NzbDrone.Mono
 
             try
             {
-                return GetDriveInfoLinux(path).AvailableFreeSpace;
+                var driveInfo = GetDriveInfoLinux(path);
+
+                if (driveInfo == null)
+                {
+                    Logger.Trace("Unable to get free space for '{0}', unable to find suitable drive", path);
+                    return null;
+                }
+
+                return driveInfo.AvailableFreeSpace;
             }
             catch (InvalidOperationException e)
             {
@@ -132,7 +140,7 @@ namespace NzbDrone.Mono
                 drives.Where(drive =>
                     drive.IsReady && path.StartsWith(drive.Name, StringComparison.CurrentCultureIgnoreCase))
                     .OrderByDescending(drive => drive.Name.Length)
-                    .First();
+                    .FirstOrDefault();
         }
     }
 }